is anyone who can HELP me with that ? I can offer to pay for that as I need it.
Well I think is not so complicated to someone to "deal" with opencart everyday, so I'm asking again how to change the way of display information.

Thank for tip Chones. I'm not finish to read it, but my main problem is to display info like this set:
[name of subcategory - products] .... [name of subcategory - products] when I click on category. There is a photo inluded "before, actually got" so first step is done, i see all subcategories and products but not this way what I want.

Any more TIPS how to separate sub/categories from products ? Well when Im finish it i will share with rest. This combination is good if you wanted to sell products and can compare prices on the same page from the choosen category.
Thank you

Well, the products that show up on the top-level category page are not necessarily related to the category - you choose which products show up - you can have none, one, or as many as you want. I think you can even have products not from the category.

What you want to do is list the sub-categories as normal, but also list all products in the sub-category as you do so. I don't have time to write that, but there is sort of a solution in the comments of one of my blog posts here:

Thank you Chones, this is the best tip for me, unfortunately still have a problem how to do this. Well I have no idea how to start to change some of the code (engine), but no problem to make font-end of it. Eh...

Below there is a code of category.tpl
You can see result on the image attached.